Radiator core



July 3, 1923. l 1,460,772

-q v`F.ToDD RADIATOR cRE Filed J'ulyl 26.. `:1920

,5X #rraemgr Patented July 3, 192,3.

UNITED STATES FRANK TODD, 0F MINNEAPOLIS, MINNESOTA.

RADIATOR CORE.

Application led July 26, 1920. Serial N0. 399,176.

To all whom z't may concern:

Be it known that I, FRANK TODD, a citizen of the United States, 'and aresident of Minneapolis, in the county of Hennepin and State ofMinnesota, haveA invented certain new and useful Improvements inRadiator Cores, of which the following is a speciiication.

One object of my invention is to provide in a radiator core an improvedform of tube.

Another object is to provide an improved form of fin used inconstructing the radiator tube.

Another object is to provide a type of fin strip that can be formed intoa rigid structure that will reinforce the tube to which it is assembled,give a. maximum amount of radiation, and also be economicalto'manufacture.

lVith theseand incidental objects in view, the invention consists oflcertain novel features of construction and combination of parts, theessential elements of which are hereinafter described with reference tothe drawing which accompanies and forms al` that shown-in Figure 4;Figure 6 is an end View of the blank shown in Figure 2 after it has beenformed and partly closed; Figure 7 is an end view' of the tube shown inFigure 4; and Figure 8 is a side eleva tion of the fin strip after ithas received the first forming operation.

In making my improved fin strip I firstform a blank, as shown in Figure2, having a pluralityv of right 'and left hand fin portions 1. Apertures2 are spaced between the tin -portions and slots 3 are punched out inthe center of the strip, and lips 4 formed on one side thereof,corresponding hinge portions 5 being left between the slots 3.

' The blank so made is formed alternately right land left along thelines 6. and '7, pro-v ducing a structure such as shown in Figure 8.

The blank as formed in Figure 8 is then folded together, bending at thehinges 5, as shown 1n Figure 6, and the tube l8 placed 1n the t-ubularopening 9 formed by the 'closing together of the two halves of the'- instrip, as partly shown in Figure 7.

The lips 4 are locked over the edge of the adjacent metal, therebyholding the formed fins solidly onto the tube.

The assembled tube is 'then dipped to solder the lin stripl to the tube,thereby creatmg a joint of high conductivity between the fins and thetube.

A suitablev number of tubes so completed only difference being thatportions 12 and 13 are blanked out to lighten the completed fin strip.

j While I have described my invention and illustrated it in twoparticular desi s, I do not wish it understood that I limit myself tothis construction, as it is evident. that the application of the,invention may be varied in many ways within the scope of the followingclaim:

Claim:

'A fin strip formed of a single piece of material and comprising twosubstantially similar portions, each of said portions being formed of aplurality of lin portions, the

inne-r edge of one of said fin portions ex' tendingy downwardly andjoining the inner edge of the adjacent fin portion from which 1t isspaced, the outer edge1 of said last named port-ion extending downwardlyand joining the outer edge of the next adjacent fin portion from whichitis ,likewise spaced, j

said two similar portions being joined together by lips extendingtransversely from adjacent extensions from said inner edges of adjacentfin portions, each of said lin portions being cut away semi-circularlyat the center of one side so that when said two similar portions arebrought together a.

tubular aperture extends axially throughthe structure so formed.

. FRANK TODD.

